That's not easy to follow.
A trade is where two people each have different things, and both decide that they'd be better off if they had what the other has even if they gave up what they have. The only kind of deal I can imagine that would be one way or unfair would have to be something forced, and if so then it wouldn't be a trade deal --it'd just be theft.
Tarriffs asymmetrically applied is what I am referring to.